ASTM A815 UNS 31803 Buttweld Fittings
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ASTM A815 UNS S31803 is a standard specification for wrought ferritic, ferritic/austenitic, and martensitic stainless steel duplex, super duplex, and lean duplex steel butt-welding fittings. These fittings are intended for use in pressure piping and pressure vessel service at moderate to high temperatures.
ASTM A815 UNS 31803 Buttweld Fittings Specifications :
| Specifications | ASTM A815 / ASME SA815 |
| Dimensions | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43 |
| Size | 1/2" to 60″ |
| Type | Seamless / Welded / Fabricated |
| Production | Elbow, Tee, Cross, Reducer, Stub end, Cap |
| Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
| Thickness | Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS |
Duplex steel butt-weld fittings specification
ASTM A815: This is the standard specification established by the American Society for Testing and Materials (ASTM), which provides guidelines for the manufacturing and use of wrought stainless steel butt-welding fittings.
UNS S31803: This is a grade designation from the Unified Numbering System (UNS) for stainless steels. UNS S31803 is a duplex stainless steel, which means it has a two-phase microstructure consisting of both austenitic and ferritic stainless steel grains. This combination of microstructures imparts the material with improved strength and corrosion resistance compared to standard austenitic stainless steels.
Butt-Weld Fittings: These are components used to connect pipes of various sizes and shapes in a piping system. Butt-weld fittings are welded to the pipes, creating a strong and leak-resistant joint. They come in various shapes such as elbows, tees, reducers, caps, and more.
Duplex Stainless Steel: Duplex stainless steels like UNS S31803 have a balanced microstructure of austenite and ferrite phases. This results in a combination of high strength and excellent corrosion resistance, particularly in aggressive environments such as those containing chlorides
Applications: ASTM A815 UNS S31803 butt-weld fittings find applications in industries where corrosion resistance, high strength, and good weldability are crucial. These can include oil and gas exploration, chemical processing, petrochemical plants, marine environments, and more.
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